(19)
(11) EP 1 166 815 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
16.01.2002 Bulletin 2002/03

(43) Date of publication A2:
02.01.2002 Bulletin 2002/01

(21) Application number: 01124817.6

(22) Date of filing: 25.10.1999
(51) International Patent Classification (IPC)7: A61M 16/00, A61M 16/12, A61M 16/20
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

(30) Priority: 23.10.1998 US 178466

(62) Application number of the earlier application in accordance with Art. 76 EPC:
99956657.3 / 1045712

(71) Applicant: Pulmonetic Systems, Inc.
Colton, CA 92324 (US)

(72) Inventor:
  • The designation of the inventor has not yet been filed
     ()

(74) Representative: Dam, Jens 
Budde, Schou & Ostenfeld A/S Vester Sögade 10
1601 Copenhagen V
1601 Copenhagen V (DK)

   


(54) Ventilator system


(57) A portable mechanical ventilator (10) uses a constant-speed compressor (20) and a recirculating bypass circuit. Bypass flow is governed by a spring-biased bypass valve (26) so connected to both the inlet and the outlet of the main flow control valve (12) as to maintain a differential pressure across the flow valve (12) sufficient to operate the ventilator (10) with minimal energy consumption. The flow valve (12) is operated by a microprocessor (82) in accordance with empirically derived lookup tables to both produce the desired air flow and provide a measure of that air flow.






Search report